Hello Roswitha!
(Spoiler request: I haven't read anything after
Deception on His Mind so please don't let me know anything that happens after that novel, ok?

)
My best friend in High School had a glandular condition. She was brilliant mentally but was very small and looked as if you took a "normal sized" girl by the neck and ankles and somehow squeezed her together. She wasn't a dwarf, but just very, very short and stocky -- fat. I know how much the poor dear heart dieted but nothing helped -- at one point she was only eating a one carrot, one egg white, and one slice of toast a day, but none of the weight budged off her body.
Her face was squeezed together too. She had beautiful blue eyes, but they were hidden by too-thick brows of black, and her thick black hair was very beautiful but never cut in a flattering style for her square face. I think of "M." when I think of Barbara Havers. I am just happy that my friend never smoked -- she was so desperate to lose weight, but she was just built like a sturdy little person -- heavy thick bones and stocky compact body. She was about 5 feet tall.
I too, was surprised to read Havers' description in the books. I'm so used to thinking of beautiful Sharon Small playing the role (and if you've ever seen her in "Mistresses" you'll know what I mean by beautiful!) Even with minimal makeup and a bad haircut, Havers in the series looks feminine and pretty -- especially in "A Suitable Vengeance" when she dons the simple black dress to come down for dinner.
The Havers described in the book series (if she were in the TV series) would probably wear a Hawaiian shirt, plaid skirt, and her signature red high-topped trainers!
But I agree, Roswitha, I found myself wondering *why* the Barbara of the books goes out of her way to appear unattractive to men. Some men like "curvy" women -- in fact most prefer them to the bone-stick-thin supermodels if surveys are to be trusted. And while Barbara (of the books) could watch her diet, exercise, give up smoking, get a better haircut for her mouse-blonde hair (and maybe a coloring), and get a personal shopper for an hour to help her pick out a better wardrobe of clothes, I guess we're supposed to just love her as she is!
(As Lady Helen, St. James, Deborah, and, perhaps Lynley himself, do!)
Hugs,
Lynn